nanodano's blog

Node.js is the server side version of JavaScript. Since it is not limited by the web browser, we can access files on the file system. Here are several code snippets that demonstrate how to read, write, move, delete, change ownership, change permission, check if exists, and get statistics file size, timestamps, and ownership for files.

These code snippets demonstrate how to access command line arguments for a Node.js program.

jQuery provide a convenient way to access elements using CSS selectors. Node.js has a package called Cheerio that allows us to make jQuery style code. The Request module can be used in tandem to provide the ability to perform an HTTP GET to fetch remote HTML documents. That is useful for web scraping.

WebRTC stands for Web Real Time Communication and is a relatively new method for accessing video and audio from the browser. It allows us to write JavaScript code for the browser that can directly access a microphone or webcam. No flash or plugins needed. These examples show how to access audio and video using Firefox.

Perl is commonly used for sysadmin tasks which frequently involves managing files. These examples demonstrate how to read, write, and append files with Perl.

This example shows how to get information from the user using Standard Input (STDIN), which is typically the keyboard.

Exif information is a group of meta tags stored on an image. It can contain information about the image, the camera used to take it, software used to manipulate it, latitude and longitude, and even more. This example shows how to use Perl to extract and manipulate image exif data.

This example shows how to list the contents of directories in Perl. It also demonstrates how to change directories, create directories, differentiate between files and directories, and use a regular expression to limit the results or search for particular file names or extensions.

Serial communication is still used a bit today. Arduino's are fun programmable microcontrollers and the main method of communication is serial over USB. This example will show you how to communicate using serial in Perl.

CPAN is a Perl tool for installing and managing modules. CPAN stands for the Comprehensive Perl Archive Network. There are many mirrors around the world that host the same CPAN archive. Sometimes mirrors shut down or you may want to add mirrors that are closer to you. These examples demonstrate how to add and remove mirrors from your configuration.